Hollow typographic element



Feb. 19, 1929. 1,702,903

M. c. INDAHL HOLLOW TYPOGRAPHIC ELEMENT Original Filed July 1, 1927 2 Sheets-Sheet 1 g /9 F163. A5 m Mauritz CJndahl,

I H/J' HITOE/VEK M. C. INDAHL HOLLOW TYPOGRAPHIC ELEIENT Feb. '19,.1 929. I 1,702,903

Original Filed July 1927 2 Sheets-Shoot 2 MfK/KEK Fatented Feb. 19, 1939.

UNITED STATES PATENT OFFICE.

MAURITZ C. INDAI-IL, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO LANSTON MONOTYPE MACHINE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORA- TION OF VIRGINIA.

HOLLOW TYPOGRAPHIC ELEMENT.

Original application filed July 1, 1927, Serial No. 202,858.

Divided and this application filed March 19,

1928. Serial No. 262,851.

This application is a division of my copending application Serial No. 202,858, filed July 1, 1927, the said co-pending application describing and claiming a mold which may be emplo ed in connection with a suitable typograp iic casting machine for producing the" hollow typographic elements which form. the subject matter of the present application.

This invention relates to typographic printing elements and its principal object is to provide a printing element such as printing type cast from type metal, which has a cored or hollow body, and is of such construction as to successfully stand up under the heavy compressive strains encountered in the processes of stereotyping printing and the like and at the same time to possess a perfect printing face or surface. Other objects wi l appear in connection with the following description of the embodiment of the invention illustrated in the accompanying drawings forming a part of this specification, in which drawings Fig. 1 is a plan view of a mold.

Fig. 2 is a vertical section approximately on line 2 2 of Fig. 1.

Fig. 3 is a vertical section approximately on line 33 of Fig. 1. I

Fig. 4 is a perspective view of the mold blade and core.

Fig. 5 is a perspective view of the parts of Fig. 4 shown in separated relation.

Fig. 6 is a perspective view of a type.

Fig. 7 is a vertical section of the type.

F 8 is a perspective view of a modified form of blade and double core, and

Fig. 9 a perspective view of a type produceablo with the blade of Fig. 8.

The mold shown in the drawings is similar in its general construction to that shown in U. S. Letters Patent No. 980,960, dated J anuary 10. 1911. Such a mold is well known to those skilled in the art as is also its application to and use in conjunction with a suitable type casting machine such as that marketed by Lanston Monotype Machine Company. A description of such amachine is unneoessary here and the mold shown may be readily identified by referring to the base plate 1,

front abutment 2, squaring block 3, side blodks 4, through bolt 6, cross block 7, the nozzle seat and opening 10.

The type element of the present invention is cored or hollow and is shown in Figs. 6 7 and 9. For producing the hollow or space in the element the mold is equipped with a core piece 8 provided with'a hole 9 through which the bolt 6 extends to hold the core 8 fixed relatively to the mold base and side blocks. At the sides of the core are point blocks 11 filling the space between the core and the side blocks 4, the point blocks and the core separating the slde blocks a distance corresponding. to the point size of the mold. The core 8 is so held that its forward end is spaced slightly from the cross block 7. This space may be more or less and insures the unimpeded operation of the cross block and also allows for flow of metal between the latter and the forward end of the core 8. This metal forms the strengtheningend wall 12 of the element 13 SFig. 7). The top wall 14 of the core 8 is a p ane surface sloped so that its lower edge at that side of the mold cavity at which the molten metal is admitted or, in other words, its lower edge is substantially above the metal entrance through the nozzle opening and the jet opening 15. Due to this slope, the metal, as it flows over the to of the core, is forced by the wedgeshape form of the space between the top of the core and .the matrix which is clamped against the top of the mold and is shown in dotted lines at 16 in. Fig. 3, against said matrix with the resultthat a type face or printing surface is produced which aprn-ozwhes a perfect face. I

The mold blade is of course slidable between. the side blocks 4. It made of a main piece 17 provided with a vertical tonguelS and a side piece 19 provided with a vertical groove 20 to fit the tongue 18. The tongue and groove connection permits the easy assembly of the blade and assures the sliding back and'forth of both blade members in unison. When assembled the blade is hol- Q p om s d to s de o accommod the core 8 and the point blocks 11 and the main piece ii" is provided with an opening at its ii'orward end corresponding to the cross section 01 the core 8. The side piece 19 its against the side wall of the core so that the blade is thus built around the core and slides thereover, the core extending beyond the blade into the mold cavity previously set forth. The mold cavity is formed by the base of the mold and the vertical walls of the side blocks 4:, the cross block 7 and the forward end of the mold blade, and the core 8 within the mold cavity is spaced from the base, the side blocks and the cross block. Thus the mold cavity is partly filled by the core.

As shown the bottom wall or the core is parallel with the base, the side walls are parallel to the side walls of the bloc IS 4 and the end of the core is parallel to the cross lJlOCli wall. The top wall of the core sloped as previously set forth at an angle from the horizontal. The core thus extends into the cavity at an angle to the side walls. The metal entrance is at one side of the core as shown in Fig. 3.

In the operation of the mold, the mold blade is drawn back to tne proper set size, the

matrix is clamped to the mold seat and the nozzle and pump (not shown) come into action to inject molten metal through the nozzle opening 10 and the jet opening 15. The metal within the mold cavity passes up on one side of the core, and impinges on the matrix, the stream then passing up the slope oi? the core top and being thus wedged almost instantzmeously against the full face of the matrix; the stream then turns downwardly at the other side of the core and the bottom space is also filled. The operation of the mold results in extremely dense and heavy types and it is believed that a circm latory movement of the metal has the ei'l'ect of driving the mold cavity air before the onrushing metal down into the ct, thus leaving the type unusually solid. It has been shown in practice that the weight of the type approaches that oi a so-called solid type even though the type of this iHXKllfiOh has a relatively large hollow or cored portion. The operation also results inv type laces or prin ing surfaces which are practically perilect, this beil'lg attribute l to the wedging action caused by the slope of the core and the choked outlet at the thin edge oil? the wedge, this thin. edge at the upper edge of the sloped lop oi? the core. The type, due to its density, is capable of holding up rcmarlnibly well against compression pressures exerted on its face, such as are encountered in the dry mat processes of stereotyping. The hollow type 13 shown in Figs. 6 and 7 has a bottom wall. 21, a vertical wall 22, an opposite side wall 23, an end wall 12 and a top wall 24- bearing the printing face and connecting the vertical, side and end walls. This top wall is wedge shapedv as seen in vertical section taken at right angles to the side wall 23, the thick 1 part of the wedge being at the meeting oii said top wall and said vertical wall 22. This wall 22 directly above the metal entrance in the base, of the mold so that the molten metal is admitted above the core at the large end of the wedge and is forced by the cam action of the top wall of the core against the matrix, there being a choke effect at the thin end of the wedge which is, in the finished type, at the meeting of the top wall 2% and the side wall 23.

in the modification shown in Figs. 8 and 9, a double core is employed and a type 13' having two hollow portions is produced, the metal entrance being central or below the central vertical wall 22. This type has a bottom wall 21, opposite side walls 23 and a top wall 24 the latter being double wedge shaped, the thick end of each wedgebeing at the meeting of the top wall with the central vertical wall, and the thin edge at the meeting of the top wall with the opposite sine wall. The mold blade shown in Fig. 8 comprises the main piece 17 and the side pieces 19 each connected with the piece 17 by a tongue and groove connection. There are also provided the necessary point blocks 11 and the cores 8 and 8. Each of the cores has a slopi top wall 1st, l l like the core 8 but the top wall of core 8 slopes one way while that of core 8 slopes in the opposite direction so that the lowermost edges of these top walls are adjacent but are separated to form a space in which the central wall 22 of the type 13 is cast, this space, when the mold is assembled being above the metal entrance formed by the nozzle opening 10 and the jet opening thereabove.

I claim:

1. A hollow typographic element having a printing face comprising a vertical wall, an opposite side wall and a top wall connecting the vertical wall and the side wall and bearing the printing face, said top wall being wedge shaped in vertical section, taken at right angles to the side wall, the thick part of said wedge being at the meeting of said 'ertical wall. and said top wall and the thin part oi? said wedge being at the meeting of said opposite side wall and said top wall.

Bi hollow typographic element having a printing i ace comprising a vertical wall, an opposite side wall, an end wall, a bottom wall and a top wall connecting the vertical wall, the side wall and the end wall and bearing the printing :lt'ace, said top wall being wedge shaped in vertical section taken at right angles to the side wall the thick part of said wedge being at the meeting of said vertical wall and said top wall and the-thin part of said wedge being at the meeting of said opposite side wall and said top wall.

3. A hollow typographic element consisting: of type meta]. of great density and comprising a vertical side Wall, an opposite side wall, said Walls being spaced apart to form a hollow poruon, and a top Wall connecting n said side Wane, the outside surface of said top Wall being horizontal and bearing a printing face of extreme density and perfection 0t from the outside surface, the shortest of said distances being substantially at the meeting of said inside surface with one of said side Walls.

MAURITZ C. INDAHL. 

